Genius Annotations
LimeLite
LightTag
Good Annotations
Weava
Annotate by Convergely
Memex
Marker.io for Slack
Qiqqa
Mendeley
Zotero
JabRef
Citavi
Docear
Paperpile
BibDesk
Genius AnnotationsQiqqa is by far the strongest solution for research and managing pdf's. Zotero, named as a comparison is weak as it does not allow pdf;s to be loaded into its interface - you need to use a pdf reader, which defeats its whole purpose. With Qiqqa documents in a library can be searched together. It has excellent maps of your libraries. It is not prefect, having a few glitches, but still is the only one of its kind.
LimeLite - A simple, easy-to-use annotation tool for Mac
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
LightTag - The text annotation tool for teams
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Good Annotations - A online annotation tool that is perfect for providing feedback to your team.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .
